If anyone can help please answer the following:

1. Are Bosch, Mann, Hengst good parts for air and fuel filters versus the OEM you can buy at the dealership?

2. For a tune up, is anything else needed other than new spark plugs properly gapped? Are Bosch good ones to use?

3. Is it difficult to install a new fuel filter and when should this be done?

4. I am leasing this car and may buy it because my wife loves it. Are there any long term problems and, under good conditions and proper maintainance, what kind of engine mileage could I expect if nothing major goes wrong?

THANKS!!!!!!!